JP2010005393A - Feeder which feeds fabric during operation of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a feeder by which fear for a needle breakage and/or missed stitches is reduced, and to realize a sewing machine equipped with the feeder. <P>SOLUTION: The sewing machine includes a needle plate which has a needle plate cutout section, and a needle bar which has a sewing machine needle. The needle bar vertically moves on the needle plate. This feeder is arranged in the needle plate cutout section for performing the feeding movement. The feeder is designed in a manner to be friction-engaged with a fabric and to perform the feeding movement and adjacent to a needle moving region. In addition, the feeder has a base body, and the feeding section is fix-connected with a feeder carrier through the base body. A feeder wall is arranged under the feeder section and adjacent to the needle moving region. The feeder wall is designed in a manner to extend to the side of the needle being away from a stitch forming tool which interacts with a needle during a sewing process when the feeder is attached. By an adjusting apparatus, the distance of the feeder wall to the needle moving region can be adjusted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The invention relates to a feeder for feeding dough during operation of a sewing machine according to the preamble part of claim 1.

  This type of feeder is known, for example, from US Pat.

  In the operation of the sewing machine, the sewing needle is deformed or even damaged, especially when handling heavy materials such as leather. Furthermore, when the sewing needle is deformed by the fabric, this can be a dislodging stitch because the loop of the needle thread guided by the sewing needle is not correctly gripped by the stitch forming tool interacting with the needle thread.

JP2004 / 174120A

  The object of the present invention is to improve a feeder of the type mentioned at the outset so that needle breakage and / or stitches coming off are reduced.

  This object is achieved according to the invention by a feeder having the features of claim 1.

  According to the present invention, the adjustable feeder wall effectively allows the operated sewing needle to be separated from the undesired deflection caused, for example, by heavy fabrics, on the side away from the stitch-forming tool that interacts with the needle in the sewing process. It was found to be protected. The feeder wall is adjusted such that it supports the sewing needle even when the sewing needle is deflected small in the direction of the feeder wall. Therefore, the sewing needle is prevented from being damaged or bent. Furthermore, the adjustable feeder wall prevents unwanted movement of the thread loop towards the side away from the stitch forming tool interacting with the needle. This ensures that the yarn loop is gripped by the stitch forming tool. The sewing machine may be a single needle sewing machine or a double needle sewing machine. When the sewing machine is configured as a double needle sewing machine, when the feeder is attached to the double needle sewing machine, two feeder walls may be provided, each of which has one associated stitch forming tool (eg hook) On the contrary, it is placed away from it. Instead of two feeder walls, the double needle sewing machine may have a common feeder wall, both sides of which are configured to support one of the two needles of the double needle sewing machine in each case.

  The continuous adjustment of the distance according to claim 2 enables a particularly fine and therefore precise setting of the distance of the feeder wall relative to the needle movement area. Alternatively, adjustment of the distance of one or more steps is also conceivable.

  The adjusting device according to claim 3 is realized at low manufacturing costs.

  The weakened part according to claim 4 is a solid joint that allows a predetermined deflection of the feeder wall for adjustment of the feeder wall.

  It has been found that a reduction in the wall thickness of the weakened part according to claim 5 is particularly suitable for realizing an elastic displacement of the feeder wall for its adjustment.

  The channel groove according to claim 6 improves the deflectability of the feeder wall during its adjustment. The passage groove is in particular a blind groove, which ensures that the feeder wall is connected integrally with the adjacent part of the substrate despite the passage groove.

  The improved deflection of the feeder wall applies in particular to the embodiment of the adjusting device according to claim 7.

  The design of the adjusting device according to claim 8 allows simple adjustment.

  The embodiment of the adjusting part fixed to the carrier according to claim 9 is particularly stable. In this embodiment, the adjustment portion secured to the carrier is not a separate component from the feeder. The adjustment part may be an integral part of the substrate. Therefore, the mobility of the adjusting portion fixed to the carrier with respect to the feeder wall is realized by the joint. The joint is a weakened portion in the transition region between the feeder wall and the feeder substrate. In general, the design of a plurality of configurations of the feeder is also conceivable, for example, the adjusting portion is a portion that can be detached from the remaining feeders. It is also conceivable to design an adjustment part as a swivel element connected to the feeder base via a swivel joint.

  The advantages of the sewing machine of the adjusting device according to claim 10 correspond to the advantages described above in connection with the feeder according to the invention.

FIG. 3 is a side view of both sides of the sewing machine, revealing some internal details of the sewing machine. FIG. 2 is an enlarged, more detailed view of the stitch forming area of the sewing machine according to FIG. 1 with sewing needles, hooks and feeders for the fabric. It is the perspective view of the feeder seen diagonally from the side away from the needle movement area. FIG. 4 is a perspective view of the feeder from a visual direction substantially opposite to the visual direction of FIG. 3. It is a top view of a feeder. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
The sewing machine 1 includes a base plate 2, a stand 3 extending upward therefrom, and a vent arm 4. The arm 4 ends at the head 5. An arm shaft 6 is provided to rotate on the arm 4, and drives a crank drive 7 having a thread lever 8 in the head 5. The crank drive 7 is drivably connected to a needle bar 9 provided to move in the head 5. The needle bar 9 has a sewing needle 10 at its lower end. The sewing needle 10 can be moved up and down by the crank drive 7, and therefore the sewing needle 10 passes through a needle movement area described below. The needle thread 13 supplied by the bobbin 12 via the thread tensioning device and the thread lever 8 is guided into the eye of the sewing needle 10.

  The base plate 2 is provided with a support plate 14, in other words, a needle plate on which a single fabric 15 is disposed. The support plate 14 has a feed plate opening (feed dog opening), in other words a needle plate cutout 16 designed to allow the feeder or feed dog 17 to pass through. The feeder 17 has a needle hole 18 through which the needle 10 passes. The feeder 17 is driven via a feed / lift drive that is driven under the base plate 2.

  Under the support plate 14, a hook 19 having a hook body 20 with a hook tip 21 is arranged. The hook body 20 is fixedly connected to a shaft having a vertical rotation shaft 22 extending in parallel with the needle bar 9. The shaft is provided to rotate on a mounting support 23 screwed to the base plate 2. Further, a drive shaft 24 is provided on the attachment support portion 23 and is connected to a gear drive disposed inside the attachment support portion 23. The drive shaft 24 is drivably connected to the arm shaft 6 via a belt drive 25.

  FIG. 2 shows a more detailed view of the stitch formation area of the sewing machine 1. The figure shows the situation after the sewing needle 10 has been retracted from the needle hole 18 again in the direction of top dead center. Under the stitch hole 18, the needle thread 13 forms a needle thread loop 26 that is interwoven with a bobbin thread 27 during a subsequent weaving process. The bobbin thread 27 is supplied to the stitch formation region by a bobbin housing, in other words, a bobbin housing disposed on the hook body 20. In FIG. 2, the sewing direction is indicated by a directional arrow N.

  3 to 6 are detailed views of the feeder 17. The feeder 17 has an upper feed portion 28 with a surface designed like a saw tooth on both sides of the needle hole 18 for frictional engagement with the fabric 15. The feed portion 28 performs feed movement at the feed dog opening 16, in other words, at the needle plate cutout portion. The feed movement is controlled by a feed / lift drive. Since the feed portion 28 surrounds the needle hole 18 in the shape of a ring, the feed portion 28 is close to a needle movement region 29 indicated by a broken line in FIG.

  The feed part 28 is fixedly connected via a substrate 30 to a feeder carrier in the form of a carrier bar 31 which is part of a feed / lift drive for the feeder 17.

  A feeder wall 32 is disposed below the feed portion 28 and adjacent to the needle movement area 29. When the feeder 17 is installed (see FIG. 2), the feeder wall 32 extends to the side of the needle 10 away from the stitch forming tool, in other words from the hook tip 21 of the hook 19 and interacts with the needle 10 during the sewing process. To do. Thus, the needle 10 is located at the bottom dead center between the feeder wall 32 and the optional needle protection plate of the hook 19.

  A distance A (see FIG. 6) from the needle movement area 29 to the feeder wall 32 can be adjusted by the adjusting device 33. The adjusting device 33 is designed for continuous adjustment of the distance A. The adjusting device 33 has an adjusting part 34 fixed to the carrier 31. The adjustment portion 34 is designed as a web that extends horizontally when the feeder 17 is attached, and is integrally connected to the base body 30 of the feeder 17. Furthermore, the adjustment device 33 has an adjustment body 35 in the form of a hexagon socket screw that functions as a setting screw. The adjusting body 35 is screwed to a complementary female screw 36 of the adjusting portion 34 fixed to the carrier 31. The free end 37 of the adjustment body 35 is supported with respect to the feeder wall 32 side away from the needle movement region 29. Depending on the threading depth of the adjusting body 35 in the female thread 36, the adjusting body 35 is supported on the one hand on the adjusting part 34 fixed to the carrier 31 and on the other hand supported on the feeder wall 32. The power is adjustable.

  The feeder wall 32 has a weakened portion 40 having a reduced wall thickness between a support portion 38 on which the adjusting body 35 is supported and a transition portion 39 (see FIG. 6) towards the feeder portion 28. In the weakened portion 40, the wall thickness of the feeder wall 32 is reduced by almost half.

  The feeder wall 32 is separated from the adjacent portion 41 through a passage groove (passing groove) 42 (see FIG. 4). The adjusting body 35 is supported on the support portion 38 of the feeder wall 32, in other words, on the free end of the feeder wall 32 between the two passage grooves 42.

  When adjusting the feeder wall 32, the adjusting body, in other words, the hexagon socket screw 35, is screwed until it can just pass through the feeder wall 32 when the needle 10 is at bottom dead center. Therefore, the feeder wall 32 moves in the direction of the needle movement area 29. Compared to the neutral position without force according to FIG. 6, the adjusted feeder wall 32 is around the weakened part 40 towards the needle movement area 29 due to the force of the adjusting body 35 acting on the area of the support part 38. It is turning. Therefore, the weakened portion 40 acts as a joint.

  When the needle 10 is deflected from the hook 19, this undesired deflection movement of the needle 10 is avoided by the needle 10 abutting against the adjusted feeder wall 32 when piercing heavy material such as leather. Thus, the feeder wall 32 acts as a counter support for the needle 10 in the opposite direction of the support effect provided by the optional needle protection plate of the hook 19.

  Furthermore, since this deflection movement is stopped by the feeder wall 32, the adjusted feeder wall 32 prevents undesired movement away from the hook 19 of the needle thread loop 26 formed at the loop lift position shown in FIG. To do.

  Depending on the thickness of the sewing needle 10 used, the feeder wall 32 can be finely adjusted in a simple manner by the adjusting body 35.

1 Sewing machine 15 Fabric 17 Feeder 29 Needle movement area 32 Feeder wall

Claims (10)

A feeder (17) for feeding the fabric (15) during operation of the sewing machine (1),
A feed portion designed to frictionally engage the fabric (15) and performing feed movement at the needle plate cutout (16) of the needle plate (14), wherein the feed portion is adjacent to the needle movement area (29). A feed portion (28);
A substrate (30) through which a feed portion (28) is fixedly connected to a feeder carrier (31);
A feeder wall (32) disposed below the feed portion (28) and adjacent to the needle movement area (29);
The feeder wall (32) is on the side of the needle (10) where the feeder wall (32) leaves the stitch forming tool (19) interacting with the needle (10) during the sewing process when the feeder (17) is installed. In the feeder (17) designed to extend,
A feeder comprising an adjusting device (33), wherein the distance (A) of the feeder wall (32) relative to the needle movement region (29) can be adjusted via the adjusting device.   Feeder according to claim 1, characterized in that the adjusting device (33) is designed for continuous adjustment of the distance (A).   The adjusting device (33) is supported against the adjusting part (34) fixed to the carrier (31) and on the one hand to the adjusting part (34) fixed to the carrier (31) and on the other hand the feeder wall (32). The feeder according to claim 1, wherein the feeder has an adjustment body (35) supported against the feeder, and the support force can be adjusted.   The feeder wall (32) has a weakened part (40) having a reduced wall thickness between the support part (38) on which the adjusting body (35) is supported and the transition part (39) towards the substrate (30). The feeder according to claim 3, wherein the feeder is provided.   5. Feeder according to claim 4, characterized in that the wall thickness of the feeder wall (32) is reduced by half in the weakened part (40).   Feeder according to any one of the preceding claims, characterized in that the feeder wall (32) is separated from the adjacent part (41) of the base body (30) via a passage groove (42).   7. Feeder according to claim 6, characterized in that the adjusting body (35) is supported against the free end (37) of the feeder wall (32) between the two passage grooves (42).   The adjusting body (35) is a setting screw screwed into a screw (36) of the adjusting portion (34) fixed to the carrier (31), and the free end (37) of the setting screw is attached to the feeder wall (32). It is supported with respect to the feeder as described in any one of Claims 3-7 characterized by the above-mentioned.   9. Feeder according to any one of claims 3 to 8, characterized in that the adjustment part (34) fixed to the carrier (31) is connected integrally with the base body (30). A needle plate (14) with a needle plate cutout (16);
A needle bar (9) having a sewing needle (10) attached thereto, which is driven to move up and down on the stitch plate (14);
Sewing machine with a feeder (17) according to any one of the preceding claims, arranged in a needle plate cutout (16) for performing a feed movement.

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